package chapter.Demo1;

import java.sql.*;
import java.util.Scanner;

public class Demo1 {
    /**
     *  模拟添加用户业务
     */
    public static void main(String[] args) throws SQLException {
        Statement stmt = null;
        ResultSet rs = null;
        Connection conn = null;
        try{
            //1. 注册数据库驱动
            Class.forName("com.mysql.cj.jdbc.Driver");
            //2. 通过DriverManager获取数据库连接
            String url ="jdbc:mysql://localhost:3306/jdbc?serverTimezone=GMT%2B8&useSSL=false";
            String username = "root";//数据库账户
            String password = "123456";
            conn = DriverManager.getConnection(url,username,password);
            //3. 通过Connection对象获取Statement对象
            stmt = conn.createStatement();
            //4. 使用Statement执行SQL语句。
            /**
             * 终端用户输入用户名 密码 邮箱
             * 将终端用户的输入添加到数据库
             */
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入用户姓名");
            String un = sc.next();
            System.out.println("请输入用户密码");
            String pd = sc.next();
            System.out.println("请输入用户邮箱");
            String em = sc.next();
            String insertSQL = "insert into useers(name,password,email) values(?,?,?)";
            PreparedStatement pm = conn.prepareStatement(insertSQL);//对插入sql进行处理了
            pm.setString(1,un);// 将SQL第一个？号绑定成un的值
            pm.setString(1,un);// 将SQL第二个？号绑定成un的值
            pm.setString(1,un);// 将SQL第三个？号绑定成un的值
            pm.executeUpdate();

            String sql = "select * from users";
            rs = stmt.executeQuery(sql);
            //5. 操作ResultSet结果集
            System.out.println("id | name | password" + "| email | birthday");
            while (rs.next()){
                int id = rs.getInt("id");//通过列名获取指定字段的值
                String name = rs.getString("name");
                String psw = rs.getString("password");
                String email = rs.getString("email");
                Date birthday = rs.getDate("birthday");
                System.out.println(id+" | "+name+" | "+psw + " | " + email + " | " + birthday);
            }
        }catch (ClassNotFoundException e){
            e.printStackTrace();
        }finally {
            //6.回收数据库资源
            if (rs != null){
                try{
                    rs.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                rs = null;
            }
            if(stmt != null){
                try{
                    stmt.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                stmt = null;
            }
            if(conn != null){
                try{
                    conn.close();
                }catch (SQLException e){
                    e.printStackTrace();
                }
                conn = null;
            }
        }
    }
}
